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Linked Data may be consumed from elsewhere to enrich an application, or contributed to the pool for use by others. The norm is, of course, to both consume data provided by others and to contribute your own back to the Commons, but this is certainly not required. A number of commercial organisations consume Linked Data from others using tools such as Open Calais, without giving anything back.
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It seems likely that the balance will shift as trust increases, but publication of some compelling case studies would help to illustrate the tangible benefits of reciprocal participation.
It’s really three options, isn’t it: Publish, Consume, Adopt. The first two are obvious; the third is applicable to organizations, using the linked data model for internal data integration.
Richard Stirling and others have emphasized that often the biggest consumers of an organization’s data is the organization itself; this is especially true for governments. Thus the “Adoption” option is highly relevant…